docs: def _next_record(self, next_line):
          """ Use loader to parse the record from the reader stream
          Supporting warc and arc records
          """
          record = self.loader.parse_record_stream(self.reader,
                                                   next_line,
                                                   self.known_format,
                                                   self.no_record_parse,
                                                   self.ensure_http_headers)
  
          self.member_info = None
  
          # Track known format for faster parsing of other records
          if not self.mixed_arc_warc:
              self.known_format = record.format
  
          return record